TLC598 Datasheet, PDF (1/10 Pages) Texas Instruments – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TL598
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
D Complete PWM Power Control Function
D Totem-Pole Outputs for 200-mA Sink or
Source Current
D Output Control Selects Parallel or
Push-Pull Operation
D Internal Circuitry Prohibits Double Pulse at
Either Output
D Variable Dead-Time Provides Control Over
Total Range
D Internal Regulator Provides a Stable 5-V
Reference Supply, Trimmed to 1%
Tolerance
D On-Board Output Current-Limiting
Protection
D Undervoltage Lockout for Low V_CC
Conditions
D Separate Power and Signal Grounds
D TL598Q Has Extended Temperature
Range . . . –40°C to 125°C
SLVS053C – FEBRUARY 1988 – REVISED JULY 1999
D OR N PACKAGE
(TOP VIEW)
ERROR
AMP 1
1IN+ ₁
1IN– ₂
FEEDBACK ₃
DTC 4
CT 5
RT 6
SIGNAL GND 7
OUT1 8
16 ^2IN+
15 ^2IN–
ERROR
AMP 2
14 ^REF
13 OUTPUT CTRL
12 VCC
11 VC
10 POWER GND
9 OUT2
description
The TL598 incorporates all the functions required in the construction of pulse-width-modulated (PWM)
controlled systems on a single chip. Designed primarily for power-supply control, the TL598 provides the
systems engineer with the flexibility to tailor the power-supply control circuits to a specific application.
The TL598 contains two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC)
comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output
control circuits. Two totem-pole outputs provide exceptional rise- and fall-time performance for power FET
control. The outputs share a common source supply and common power ground terminals, which allow system
designers to eliminate errors caused by high current-induced voltage drops and common-mode noise.
The error amplifier has a common-mode voltage range from 0 V to V_CC –2 V. The DTC comparator has a fixed
offset that prevents overlap of the outputs during push-pull operation. A synchronous multiple supply operation
can be achieved by connecting RT to the reference output and providing a sawtooth input to CT.
The TL598 device provides an output control function to select either push-pull or parallel operation. Circuit
ǒ + Ǔ ^{architecture prevents either output from being pulsed twice during push-pull operation. The output frequency}
for push-pull applications is one-half the oscillator frequency f_O
2
1
RT
CT
. For single-ended applications:
+ f_{O RT1CT.}
The TL598C is characterized for operation from 0°C to 70°C. The TL598Q is characterized for operation from
–40°C to 125°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 1999, Texas Instruments Incorporated
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